Preheating grate pot



Dec. 2, 1941.

N. JAMES ET AL PREHEATING GRATE POT 2 Sheets-Sheet ly Filed April ll, 1940 Dec. 2,1941c N JAMES E1- AL 2,264,442

PREHEATING GRATE POT Filed April 1l, 1940 2 Sheets-Sheet 2 xml.

`llwiy- /W gmc/whom NORMAN 'JAMES Patented Dec. 2, 1941 UNETED STATES PATENT @FFME Norman James and Joseph J. Zurenda, Jr., Edwardsville, Pa.

Application April 11, 1940, Serial No. 329,142

2 Claims.

This invention relates to preheating grate pots, for furnaces, boilers and the like, and has for one of its objects the production of a simple and efficient grate pot which is so constructed as to preheat water as it circulates throughout the pot and also to deliver a series of elongated air jets vertically through the bottom of the re box, to facilitate combustion of the fuel within the fire box.

A further object of this invention is the production of a preheating grate pot which is so constructed as to providea maximum water heating surface, and also to efliciently direct the air jets vertically through the fire box.

.Other objects and advantages of the present invention will appear lthroughout the following specification and claims.

In the drawings:

Figure 1 is a vertical sectional View throughY the preheating grate pot;

Figure 2 is a top plan view thereof;

Figure 3 is a fragmentary sectional perspective view of a portion of the pot;

Figure 4 is a vertical section, certain parts being shown in side elevation illustrating a modied type of grate pot wherein a plurality of separate heating chambers are provided;

Figure 5 is a horizontal sectional view taken on line 5 5 of Figure 4;

R'gure 6 is a sectional fragmentary perspective view of a further modified form of the invention;

Figure 7 is a fragmentary vertical sectional View of a portion of the type of grate pot shown in Figure 6; and

Figure 8 is a fragmentary top plan View of the pot, certain parts being shown in section and portions of the saine being drawn together for the purpose of illustrating the dividing partitions in the upper ring.

By referring to the drawings, it will be seen that A designates the grate pot, preferably comprising an inverted cone-shaped structure embodying an inner plate I and an outer plate II. 'I'he inner plate IIJ is provided with a laterally and outwardly extending circulating hollow ring I2 at the upper end thereof, as shown in Figure 1, the ring I2 preferably being rectangular in cross section, the bottom wall I3 of which extends in a horizontal plane. The inner wall ID also carries a plurality of spaced annular hollow circulating rings I4 arranged in spaced horizontal relation below the ring I2. Each ring I4 is preferably triangular in shape,

the bottom wall I of each ring extending in a horizontal plane. The rings I4 are provided with circulation connection tubes I6 by which a complete circulation between the rings is maintained from the bottom to the top of the pot A. The upper ring I4 is likewise connected to the ring I2 by communicating circulation connection tubes l'I. These tubes I6 and I'I are all arranged in staggered relation as shown in Figure 1, to facilitate circulation. An inlet pipe I8 is connected to the lower ring I4 and an outlet pipe I B is connected to the ring I2, and this pipe I9 may extend to a boiler, tank or other receptacle to receive the preheated water passing from the pot A.

lThe router plate II is arranged in spaced relation Ato the inner plate I and also to the outer edges of the rings I4, the upper edge of the plate II being secured to the under face ofthe ring I2' near the outer vedge thereof. This arrangement provides an air circulating chamber 2ii. Air jet slots 2I are arranged in the inner plate I0 in horizontal relation between the rings I4 and also between the upper ring I4 and the ring I 2, the slots between the respective rings being preferably arranged in staggered relation, as shown in Figures 1 and 2. The lower end of the inner wall is supported by a fuel supply tube 22, in which is mounted a con-.

veyor'23 for conveying fuel to the lower end of the pot A. The lower end of the outer plate II is carried by a casing 24 and may form an integral part thereof. The casing 2'4 is spaced from the tube 22 to provide an air conduit 25 leading Ato the air chamber 2U. A water jacket 26 may be provided around the casing 24, as shown in Figure 1.

v'Ine operation of the device is as follows:

The fuel will be fed to the bottom end of the pot A through the medium of the conveyor 23 and will be forced upwardly through the pot. Water will enter the pipe I8 and will be circulated through the rings I4 and pass out through the ring I2 and the pipe I9 as previously described. The various parts may be cast or welded into an integral structure and it should be understood that the outer plate or wall II is spaced from the inner plate or wall I0 and that the rings I4 are arranged in graduated spaced relation to the outer plate II, the lower ring I4 being a greater distance from the outer plate II than the upper ring I4 to facilitate the passage of the air from the conduit 25 upwardly. The air will pass upwardly and strike against the horizontal walls I5 of the rings I4 and then will be forced out through the elongated jet openings 2|, in this way forcing elongated horizontally extending jets of air upwardly through the nre box. These slots 2| are preferably small and because of the constant blast of air passing therethrough the dust from the ashes will not clog these slots, but the dust will be forced upwardly and out of the slots, the clinkers or hard part of the ashes spanning the openings and supporting the re away from the openings and in this way combustion wil be facilitated.

As shown in Figures 4 and 5, a grate pot is illustrated having an inner wall Illa and an outer wall ||a similar to the structure shown in Figure 1, to provide an air chamber 20a. The inner wall |a carries a plurality of water circulating rings Illa similar to the rings I4, which rings Illa are arranged in spaced relation and are provided with communicating tubes |6a similar to the tubes I6. An upper ring |2a similar to the ring |2 is also provided. Each ring I4a is hollow and is provided with central partitions 21, the partitions of the rings |4a being arranged in vertical alignment and the ring |2a is also provided with central partitions 28, which central partitions 28 are in vertical alignment with the partitions 21. These partitions 21 will provide a circulating compartment 29 upon one side of the center of the pot which may be used for preheating water passing to a boiler and a compartment 30 upon the other side of the center of the pot which compartment 30 may be used for heating a hot water supply which may be used such for instance as for domestic use. Th'e partitions 28 divide the upper ring |2a into compartments 3| and 32 for a similar purpose. The compartment 29 is provided with a water supply pipe |8a and the compartment 3| is provided with a water outlet pipe |9a. The compartment 30 is provided with an inlet pipe |8b and the compartment 32 is provided with an outlet pipe |9b. The compartments 3| and 32 are provided with communication tubes which communicate with the next adjoining ring |4a, as shown in Figure 4. A similar means for supplying fuel and air to the various parts is provided in the structure shown in Figure 4, this structure being similar to that shown in Figure 1. A plurality of air ports 2|a are arranged in the inner plate lila in spaced relation and between the rings |4a.

In Figures 6 and 7 there is 4shown a further modified type of the invention wherein an outer plate ||b is provided in spaced relation to the inner plate lb to provide an air chamber 201). A plurality of horizontally disposed spaced water circulating rings I4b are provided which are secured to the inner plate lb within the chamber 2Gb. These rings |413 communicate with the vertically extending water supply conduits lb, as shown in Figure 6. These conduits ||b also communicate with the upper ring |2b similar to the ring |2. The inner wall |0b is provided with air jet ports 2lb similar to those shown in Figure 1.

Having described the invention, what we claim 1. A preheating grate pot of the class described comprising a substantially inverted cone-like body constituting a re box having a fuel entrance opening at its lower end, the body comprising an inner plate and an outer plate spaced from the inner plate to provide an air chamber, a plurality of spaced horizontal hollow water circulating rings carried by the inner plate within the air chamber and arranged one above the other to provide an inverted cone, means for supplying water to the lower ring, hollow circulation connection tubes connecting the rings to provide a unitary grate pot, said connection tubes providing communicating means between the rings, the hollow rings and hollow circulation connection tubes providing means by which water may contact the inner faces of the rings and throughout the entire length of the connection tubes of the grate pot, outlet means for the upper ring, the inner plate having a plurality of air ports formed between the rings, and means for supplying an air blast to the air chamber for forcing air jets out through the air ports into the fire box of the inverted cone-like body to facilitate combustion.

2. A preheating grate pot of the class described comprising a substantially inverted cone-like body constituting a nre box having a fuel entrance opening at its lower end, the body comprising an inner plate and an outer plate spaced from the inner plate to provide an air chamber, a plurality of horizontal hollow water circulating rings carried by the inner plate within the air chamber one above the other and arranged to provide an inverted cone, means for supplying water to the lower ring, hollow circulation connection tubes connecting the rings and supporting said rings one above the other to provide said inverted dome-like body, said connecting tubes also providing communicating means between the rings, outlet means for the upper ring, the inner plate having a plurality oi air ports formed between the rings, means for supplying an air blast to the air chamber for forcing air jets out through the air ports into the fire box of the inverted cone-like body to facilitate combustion, the outer plate being spaced from the outer edges of the rings to permit the air to freely circulate upwardly between the rings, each ring having a horizontal bottom wall located adjacent the air ports for deflecting the air through the ports as the air passes upwardly through the air chamber.

NORMAN JAMES. JOSEPH J. ZURENDA, JR. 

